(3k-4r-2m)2-(3k+4r-2m)2+(3k+4r)2
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Answer:
-8r+6k
(3k-4r-2m)2-(3k+4r-2m)2+(3k+4r)2
6k-8r-4m-(3k+4r-2m)2+(3k+4r)2
6k-8r-4m-6k-8r+4m+(3k+4r)2
6k-8r-4m-6k-8r+4m+6k+8r
-8r+6k
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